c. Construct a 95% confidence interval of the true percentage of the potential voters who would vote for him. 2. Evaluating the effectiveness of medicines is a requirement for a drug company before it can sell the medicine in the market. Clinical trials are done on an experimental group whose patients receive the medicine and, on a control, group whose patients receive a placebo. In a clinical trial, the condition of 128 out of 150 patients in the experimental group improved. a. What is the best point estimate for the effectivity of this medicine in curing this particular disease? b. What is the maximum error or margin of error at 99% confidence level? c. Construct a 99% confidence interval for the true proportion of patients whose condition improved upon taking the medicine. 3. How large a sample is needed if you want to conduct a study about the effectiveness of vaccine with a maximum error of 1% and a 99% confidence level